I used to play RealBridge with Firefox 86 and previous versions by using a simple USB WebCam; when I udpdated Firefox to 88.0, RealBridge did not open properly the same USB2 Webcam. I had to recover back my Window 7 professional in order to obtain back the Firefox 86.01, then my USB WebCam turned back to work. Now I locked the Firefox autoupdate. I did not change any other set-up, what can I do ? I solved the problem by uninstalling Firefox and then by doing a new clean reinstall.